Fluid end crossbore

A reciprocating pump assembly comprising

• a power end portion;
• and
• a fluid end portion having a fluid cylinder comprising
• a body having an inlet bore, an outlet bore, and a plunger bore, the inlet and outlet bores extending through the body approximately coaxial along a fluid passage axis, the plunger bore extending through the body along a plunger bore axis that extends at an angle relative to the fluid passage axis, the body further comprising a crossbore extending through the body at the intersection of the fluid passage axis and the plunger bore axis such that the inlet bore, the outlet bore, and the plunger bore fluidly communicate with each other, the crossbore intersecting the inlet bore, the outlet bore, and the plunger bore at an inlet bore end, an outlet bore end, and a plunger bore end, respectively,
• wherein the inlet bore end and the outlet bore end are connected to the plunger bore end at respective first and second corners of the crossbore, the first corner comprising a first linear bridge segment that is connected to the inlet bore end and the plunger bore end by corresponding curved segments, the second corner comprising a second linear bridge segment that is connected to the outlet bore end and the plunger bore end by corresponding curved segments.

A method for fabricating a reciprocating pump having a fluid cylinder, said method comprising:

• forming a crossbore within a body of the fluid cylinder such that an inlet bore, an outlet bore, and a plunger bore of the fluid cylinder fluidly communicate with each other;
• machining first and second corners of the crossbore that connect the plunger bore to the inlet and outlet bores, respectively, wherein machining the body of the fluid cylinder to define the first and second corners of the crossbore comprises:
• machining a first linear bridge segment of the first corner such that the first linear bridge segment is connected to the inlet bore and the plunger bore by corresponding curved segments;
• and
• machining a second linear bridge segment of the second corner such that the second linear bridge segment is connected to the outlet bore end and the plunger bore by corresponding curved segments;
• and
• assembling the reciprocating pump without performing a manual hand blending process on the first and second corners.